I have seven 128MB SMCs...
1st one: Little John + ROMS
2nd one: fSMS + ROMS (GG & SMS)
3rd one: gpEngine + ROMS, SidPlayer, Wolf3D
4th one: fGB32 + ROMS
5th one: Frodo, Castaway, Atari 800, MSX + ROMS
6th one: Comm. Games (Mill, Pinball Dreams, Super Plusha) and a loooot of PDGames (Giana, Wolf3D, etc.)
7th one: Changes... it's my testing card
ATM: BOR, Snes9x, fgen32 + ROMS.
Waiting on my harddisk in already assorted directories (so I just have to copy the stuff I need on to a new card):
Doom, gpCinema
All my cards are configured to autoboot (when there's only a single emu on it) or with custom bootmenu using Aquafish